Head Slide and Locking Pivot Rider for Slide-Pivot Fenestration
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Solution Overview
Problem
There is a need for improved sliding and pivot fenestration units and components that enhance the functionality and versatility of sliding and pivot doors and windows, particularly in terms of their operational modes and locking mechanisms.
Innovation Solution
The fenestration units incorporate a locking pivot wheel assembly that allows panels to transition between slide and pivot modes, featuring a rider, pivot, and lock mechanism that inhibits sliding during pivot operations and vice versa, along with height-adjustable features and latch systems for enhanced control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to prevent sliding during pivot operation, then operational reliability is improved, but device complexity increases
Solution Approach 1:
The lock is integrated with the rider assembly, combining the locking function with the existing sliding mechanism. The lock pins are positioned within the rider body, and the cam mechanism is mounted on the rider, creating a unified assembly that reduces overall system complexity despite adding locking functionality.
Solution Approach 2:
The cam mechanism automatically actuates the lock pins during pivot operation without requiring separate control. As the panel pivots, the cam rotates and automatically engages or disengages the lock pins from the frame based on the pivot angle, providing self-regulating locking behavior.
2Extent of automation
If a cam mechanism is used to actuate lock pins during pivot operation, then automation is improved, but device complexity increases
Solution Approach 1:
The cam mechanism automatically actuates the lock pins during pivot operation without requiring separate control. As the panel pivots, the cam rotates and automatically engages or disengages the lock pins from the frame based on the pivot angle, providing self-regulating locking behavior.
Solution Approach 2:
The cam mechanism utilizes changes in rotational position (angular parameter) during pivot operation to trigger locking and unlocking. The cam's eccentric geometry converts rotational motion into linear displacement of the lock pins, automating the locking process based on the pivot angle parameter.
3Reliability
If lock pins are extended to engage the frame during pivot mode, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The lock pins are biased toward the extended engaged position by spring elements before pivot operation begins. This preliminary positioning ensures that when the cam actuates the locking mechanism, the pins are already near their final engagement position, reducing the precision required for the cam's actuating surface.
Solution Approach 2:
Spring elements provide a cushioning force on the lock pins, allowing for slight variations in engagement position without compromising locking reliability. The springs absorb positioning tolerances and ensure consistent engagement force even with moderate manufacturing variations.
Data Source
AI summary
A sliding and pivoting fenestration unit, such as a sliding door, with screen. Embodiments of the fenestration unit include a locking and height-adjustable pivot rider, a head slide, a screen carrier, and a method of operation.